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74AC138MOTN/a300avai1-of-8 Decoder
74ACT138NSN/a241avai3 TO 8 LINE DECODER (INVERTING)


74AC138 ,1-of-8 DecoderFeaturesYI reduced by 50%The ’AC/’ACT138 is a high-speed 1-of-8 decoder/demulti- CCYplexer. This de ..
74AC138M ,3 TO 8 LINE DECODER (INVERTING)
74AC138M ,3 TO 8 LINE DECODER (INVERTING)
74AC138MTC ,1-of-8 Decoder/DemultiplexerFeaturesThe AC/ACT138 is a high-speed 1-of-8 decoder/demulti-

74AC138-74ACT138
Rad-Hard 3 to 8 Line Decoder Inverter
TL/F/9925
54AC/74AC138
54ACT/74ACT138
1-of-8
Decoder/Demultiplexer
March 1993
54AC/74AC138# 54ACT/74ACT138
1-of-8 Decoder/Demultiplexer
General Description
The ’AC/’ACT138isa high-speed 1-of-8 decoder/demulti-
plexer. This deviceis ideally suitedfor high-speed bipolar
memory chip select address decoding. The multiple input
enables allow parallel expansiontoa 1-of-24 decoder using
just three ’AC/’ACT138 devicesora 1-of-32 decoder using
four ’AC/’ACT138 devicesandone inverter.
Features ICC reducedby 50% Demultiplexing capability Multiple input enablefor easy expansion Active LOW mutually exclusive outputs Outputs source/sink24mA ’ACT138has TTL-compatible inputs Standard Military Drawing (SMD) ’AC138: 5962-87622 ’ACT138: 5962-87554
Logic Symbols
TL/F/9925–1
IEEE/IEC
TL/F/9925–7
Connection Diagrams
Pin Assignment
for DIP, FlatpakandSOIC
TL/F/9925–2
Pin Assignment
for LCC
TL/F/9925–3
Pin Names Description
A0–A2 AddressInputs
E1–E2 EnableInputs EnableInput
O0–O7 Outputs
FACTTMisa trademarkof NationalSemiconductor Corporation.
C1995National SemiconductorCorporation RRD-B30M75/PrintedinU.S.A.
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